You are an archaeologist researching artifacts left behind by Francisco Pizzaro's conquest of Peru in the 1530s.
In order to confirm the authenticity of the leather artifacts, you are performing radiometric dating using an isotope pair that has a half-life of 250 years. In order for the artifacts to date back to the time of Pizzaro's conquest, approximately how much original radioactive isotope must be left in the artifacts?
A) 50
B) 25
C) 75
D) 12.5
Question 2
What is the definition of a half-life?
A) The parent isotope half of a radiometric dating pair
B) Half the time it takes for the parent isotope to decay to the daughter
C) The time it takes for half of the parent isotope to decay to the daughter
D) Half of the alpha particles necessary to decay at a steady rate
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